Bump nh3 from 0.2.19 to 0.2.20

Bumps [nh3](https://github.com/messense/nh3) from 0.2.19 to 0.2.20.
- [Release notes](https://github.com/messense/nh3/releases)
- [Commits](messense/nh3@v0.2.19...v0.2.20)

---
updated-dependencies:
- dependency-name: nh3
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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